orthognathousadj.

1851 R. Dunglison Med. Lexicon (ed. 8) 624/1 Orthognathous, having a vertical jaw. A term applied to the form of head in which the facial angle approaches the right angle.

1863 Q. Rev. 114 383 No law..will give us the relative dates of brachycephalous, and dolichocephalous, thick-skulled or thin-skulled, orthognathous or prognathous men.

1877 J. W. Dawson Origin of World 428 Culture tends to the elevation of the nasal bones, to an orthognathous condition of the jaws.

1881 E. B. Tylor Anthropology 62 The European is orthognathous or upright jawed.

1939 C. S. Coon Races of Europe iv. 83 By Mediterranean, in the skeletal sense alone, we mean the wide family of closely knit racial types which are long headed, orthognathous, mesorrhine or leptorrhine.

1966 C. G. Seligman Races of Afr. (ed. 4) ii. 12 The face is orthognathous, small and broad, with prominent cheek-bones, very flat nose, low but bulging forehead, and pointed chin.

1979 Current Anthropol. 20 617 The gnathic index is subdivided into three groups: prognathous, 103 and above; mesognathous, 98 to 102.9; orthognathous, up to 97.9.

1995 Ann. Rev. Ecol. & Systematics 26 355 One proposal defines H. sapiens based on shared derived characters, including relatively gracile skeleton, voluminous cranium, and orthognathous face (straight jaws).